[Freesurfer] different target image for registration

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Hello!

I would like to register my dwidata to the anatomical image (rawavg.mgz). I have run bbregister, but how can I specify a different target image? bbregister uses the orig.mgz right?

These are the commands I used: bbregister --s sub001 --mov nodif.nii.gz --reg nodif2orig.dat --dti --init-fsl

mri_vol2vol --fstarg --reg nodif2orig.dat --mov dwidata.nii --o dwialigned.nii

mri_label2vol --regheader dwialigned.nii.g --temp mri/rawavg.mgz --aparc+ageg --o labels.nii

I'm not sure if the last command is valid, because I think bbregister and mri_vol2vol use the orig.mgz, whereas mri_label2vol uses rawavg.

Best regards, Sam